<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>用户登录</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .login-container {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
            padding: 40px;
            width: 100%;
            max-width: 400px;
            text-align: center;
        }

        .logo {
            margin-bottom: 30px;
        }

        .logo h1 {
            color: #333;
            font-size: 28px;
            font-weight: 600;
            letter-spacing: 1px;
        }

        .form-group {
            margin-bottom: 25px;
            text-align: left;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #555;
            font-weight: 500;
        }

        .form-control {
            width: 100%;
            padding: 15px;
            border: 2px solid #e1e1e1;
            border-radius: 10px;
            font-size: 16px;
            transition: all 0.3s ease;
            background: #f8f9fa;
        }

        .form-control:focus {
            outline: none;
            border-color: #667eea;
            background: #fff;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }

        .btn-login {
            width: 100%;
            padding: 15px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border: none;
            border-radius: 10px;
            color: white;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            letter-spacing: 1px;
        }

        .btn-login:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
        }

        .forgot-password {
            display: block;
            margin-top: 15px;
            color: #667eea;
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s ease;
        }

        .forgot-password:hover {
            color: #764ba2;
            text-decoration: underline;
        }

        .divider {
            margin: 30px 0;
            position: relative;
            height: 1px;
            background: #e1e1e1;
        }

        .divider::after {
            content: 'or';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: #fff;
            padding: 0 15px;
            color: #999;
            font-size: 14px;
        }

        .social-login {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-bottom: 25px;
        }

        .social-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            border: 2px solid #e1e1e1;
            background: white;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .social-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .signup-link {
            color: #666;
            font-size: 14px;
        }

        .signup-link a {
            color: #667eea;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s ease;
        }

        .signup-link a:hover {
            color: #764ba2;
            text-decoration: underline;
        }

        @media (max-width: 480px) {
            .login-container {
                margin: 20px;
                padding: 30px 20px;
            }
        }
    </style>
</head>
<body>
    <div class="login-container">
        <div class="logo">
            <h1>欢迎回来</h1>
        </div>
        
        <form action="/login" method="post">
            <div class="form-group">
                <label for="username">用户名</label>
                <input type="text" id="username" name="username" class="form-control" placeholder="请输入用户名或邮箱" required>
            </div>
            
            <div class="form-group">
                <label for="password">密码</label>
                <input type="password" id="password" name="password" class="form-control" placeholder="请输入密码" required>
            </div>
            
            <button type="submit" class="btn-login">登录</button>
            
            <a href="#" class="forgot-password">忘记密码？</a>
        </form>
        
        <div class="divider"></div>
        
        <div class="social-login">
            <button class="social-btn">
                <svg width="20" height="20" viewBox="0 0 24 24" fill="none">
                    <path d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z" fill="#4285F4"/>
                    <path d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z" fill="#34A853"/>
                    <path d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z" fill="#FBBC05"/>
                    <path d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z" fill="#EA4335"/>
                </svg>
            </button>
            <button class="social-btn">
                <svg width="20" height="20" viewBox="0 0 24 24" fill="none">
                    <path d="M24 4.557c-.883.392-1.832.656-2.828.775 1.017-.609 1.798-1.574 2.165-2.724-.951.564-2.005.974-3.127 1.195-.897-.957-2.178-1.555-3.594-1.555-3.179 0-5.515 2.966-4.797 6.045-4.091-.205-7.719-2.165-10.148-5.144-1.29 2.213-.669 5.108 1.523 6.574-.806-.026-1.566-.247-2.229-.616-.054 2.281 1.581 4.415 3.949 4.89-.693.188-1.452.232-2.224.084.626 1.956 2.444 3.379 4.6 3.419-2.07 1.623-4.678 2.348-7.29 2.04 2.179 1.397 4.768 2.212 7.548 2.212 9.142 0 14.307-7.721 13.995-14.646.962-.695 1.797-1.562 2.457-2.549z" fill="#1DA1F2"/>
                </svg>
            </button>
            <button class="social-btn">
                <svg width="20" height="20" viewBox="0 0 24 24" fill="none">
                    <path d="M12 0c-6.626 0-12 5.373-12 12 0 5.302 3.438 9.8 8.207 11.387.599.111.793-.261.793-.577v-2.234c-3.338.726-4.033-1.416-4.033-1.416-.546-1.387-1.333-1.756-1.333-1.756-1.089-.745.083-.729.083-.729 1.205.084 1.839 1.237 1.839 1.237 1.07 1.834 2.807 1.304 3.492.997.107-.775.418-1.305.762-1.604-2.665-.305-5.467-1.334-5.467-5.931 0-1.311.469-2.381 1.236-3.221-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.301 1.23.957-.266 1.983-.399 3.003-.404 1.02.005 2.047.138 3.006.404 2.291-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.911 1.235 3.221 0 4.609-2.807 5.624-5.479 5.921.43.372.823 1.102.823 2.222v3.293c0 .319.192.694.801.576 4.765-1.589 8.199-6.086 8.199-11.386 0-6.627-5.373-12-12-12z" fill="#333"/>
                </svg>
            </button>
        </div>
        
        <p class="signup-link">
            还没有账户？<a href="#">立即注册</a>
        </p>
    </div>

    <script>
        document.getElementById('loginForm').addEventListener('submit', function(e) {
            e.preventDefault();
            
            const username = document.getElementById('username').value;
            const password = document.getElementById('password').value;
            
            // 这里可以添加实际的登录逻辑
            console.log('登录信息:', { username, password });
            
            // 模拟登录过程
            const btn = document.querySelector('.btn-login');
            btn.textContent = '登录中...';
            btn.disabled = true;
            
            setTimeout(() => {
                alert('登录成功！');
                btn.textContent = '登录';
                btn.disabled = false;
            }, 1500);
        });
    </script>
</body>
</html>
